Journal
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
Volume 190, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijmecsci.2020.106021
Keywords
Metamaterials; Auxeticity; Negative thermal expansion; Honeycomb structure
Categories
Funding
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [192346071 - SFB 986]
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A novel hybrid-honeycomb structure with enhanced stiffness is proposed, and its effective thermoelastic properties can be widely tunable by tailoring the microstructural geometry and the constituent materials. The structure can be designed to concurrently possess an enhanced stiffness and a high degree of auxeticity and negative thermal expansion by properly choosing the geometrical and material parameters.
Most metamaterials with negative Poisson's ratio and/or negative thermal expansion coefficient possess relatively low stiffness. In this work, a novel hybrid-honeycomb structure with enhanced stiffness is proposed. It consists of two merged hexagonal honeycombs. Analytical and computational homogenization methods are used to evaluate the effective thermoelastic properties. Analytical expressions of the effective Young's modulus, Poisson's ratio, and thermal expansion coefficient are given. We show that the effective thermoelastic properties of the structure are widely tunable by tailoring the microstructural geometry and the constituent materials. In particular, the inplane effective Poisson's ratio and thermal expansion coefficient are adjustable over a wide range, from negative to positive. By properly choosing the geometrical and material parameters, the structure can be designed to concurrently possess an enhanced stiffness and a high degree of auxeticity and negative thermal expansion.
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